A custodian is the regulated institution that holds client assets, settles trades, and produces the official account statements. The adviser directs the account; the custodian holds what is in it.
An adviser with discretion can direct trades. They do not hold the assets. The custodian does, and the custodian issues statements directly to the client.
That separation is the structural control that makes most large-scale adviser fraud difficult. Where it has failed, the common factor has usually been an adviser who also controlled the statements.
Holds the securities and cash, settles and clears trades, produces statements and tax documents, and deducts the advisory fee when the client has authorised it.
The custodian is a workflow dependency, not just a vault. Their technology determines how account opening feels, what can be automated, how rebalancing executes, and what data flows into reporting.
Advisers who have changed custodians describe it as a heavier project than they expected, because every operational process touches it.
Some firms hold client assets at more than one custodian, usually because clients arrived that way. It preserves choice and roughly doubles the operational surface, which is a genuine trade-off rather than an obvious win.
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